def triangles():
    row = 1
    list1 = []
    while True:
        a = 0
        list2 = []
        for i in list1:
            list2.append(i + a)
            a = i
        list2.append(1)
        yield list2
        list1 = list2


n = 0
results = []
for t in triangles():
    print(t)
    results.append(t)
    n = n + 1
    if n == 10:
        break

if results == [
[1],
[1, 1],
[1, 2, 1],
[1, 3, 3, 1],
[1, 4, 6, 4, 1],
[1, 5, 10, 10, 5, 1],
[1, 6, 15, 20, 15, 6, 1],
[1, 7, 21, 35, 35, 21, 7, 1],
[1, 8, 28, 56, 70, 56, 28, 8, 1],
[1, 9, 36, 84, 126, 126, 84, 36, 9, 1]]:
    print('测试通过!')
else:
    print('测试失败!')
